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Re: [Gnu-arch-users] EDelta

From: Jacob Gorm Hansen
Subject: Re: [Gnu-arch-users] EDelta
Date: Fri, 08 Apr 2005 17:53:31 -0700
User-agent: Mozilla Thunderbird 1.0 (X11/20050302)

Tom Lord wrote:
Full ACK and thank you.  I know of no *immediate* application
for tools in this category in Arch but I also know of several
tentative design discussions that will, if fully played out,
create a need for exactly this sort of tool.  So I am excited but
reserved about exploring your results.

Is Edelta a longer-term project or "merely" a significant
result along your way?  If longer-term: is there a mailing list?

What happened is that I got the idea on the way home from a conference in 2003, and started hacking up the code on the plane. I spent a few more weeks working on it full time, then got sidetracked by working on Xen and OS migration, as my research area is systems rather than compression algorithms.

The reason I decided to release EDelta more widely was to see if I am really the only one who thinks this could be a useful tool. I suppose I can setup a mailing list, or, if the Arch community is OK with it, I could point interested users to the Arch-users list for further discussion and announcements? Another option would be to try to convince the xdelta-people into extending their algorithm with similar functionality.

Another idea that I have is to package several versions of the same program binary as EDelta-deltas combined with a base exe. E.g. have

(./configure && make)  and  (./configure --enable-featureX && make)

in the same tar.gz or .deb, and then use EDelta to patch to the relevant version at installation time. This would allow Gentoo/ports-like flexibility and performance in a binary distribution such as Debian.


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